Reverses the last command or the last entry you typed. To select the command that you want to reverse, click the arrow next to the Undo icon on the Standard bar.
Reverses the action of the last Undo command. To select the Undo step that you want to reverse, click the arrow next to the Redo icon on the Standard bar.
You can change or break each link to external files in the current document. You can also update the content of the current file to the most recently saved version of linked external file. This command does not apply to hyperlinks, and is not available if the current document does not contain links to other files.